About RF Cafe

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its
primary purpose was to provide me with ready access to commonly needed formulas and reference
material while performing my work as an RF system and circuit design engineer. The Internet was
still largely an unknown entity at the time and not much was available in the form of WYSIWYG
...

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RF Cafe website are hereby acknowledged.

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Day in Engineering History Archive - October 21

October21

1833: Swedish chemist
Alfred
Nobel, who invented dynamite and who began the Nobel Peace Prize
system, was born. 1879: Thomas Edison demonstrated an
electric light bulb that lasted for 13.5 hours. 1884: Thomas
Edison received a patent for his "electrical
indicator" that resembles a
d'Arsonval movement. 1914:
Samuel Alderson, inventor of the crash test dummy, was born.
1915: The first trans-Atlantic
radiotelephone call was placed between Arlington, VA, and Paris,
France. 1923: The first
Carl Zeiss projector planetarium opened at the Deutsches Museum
in Munich, Germany. 1925: The first U.S.-made photocell was
demonstrated by Westinghouse. 1959:
Dr. Wernher Von Braun began work at NASA after a transfer from
ABMA. 1960: The first British nuclear submarine,
HMS Dreadnought, was launched. 1967: Danish astronomer
Ejnar Hertzsprung, who co-developed the
Hertzsprung-Russell diagram relating star temperatures with
brightness, died. 1976: The United States made a clean sweep of
the
Nobel Prizes, winning or sharing awards in chemistry, physics,
medicine, economics, and literature (no peace prize awarded). 2015:
This is the "Back
to the Future Part II" date that Marty McFly and Doc Brown travelled
to help save the family honor.

Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in
this article,
there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative
sources. On RF Cafe, events with hyperlinks have been verified.

Please submit significant historical events and
dates for inclusion in these lists. I will be glad to include your name and birthday. Please do not submit your death
date ;-) A couple years ago, I began commemorating the birthdays of notable people and events with
special RF Cafe logos. Where available, I like to use images
from postage stamps from the country where the person or event occurred.